Hydrocarbon Pyrolysis Method
AssigneeExxonMobil Chemical Patents Inc.
InventorsJames R. Lattner, Paul F. Keusenkothen, Frank Hershkowitz
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Abstract
Disclosed is a pyrolysis reaction process. The process can be advantageously accomplished using a pyrolysis reactor that has a primary reaction zone comprised of bed packing having multiple passages through the bed packing and a secondary reaction zone having an open flow arrangement. The process includes a step of injecting a pyrolysis feed comprising a first hydrocarbon into the primary reaction zone to produce a primary pyrolysis product containing unsaturated hydrocarbon. A reactive feed comprising a second hydrocarbon is injected into the secondary reaction zone to mix with the primary pyrolysis product and produce a secondary pyrolysis product.
Claims25
A method for pyrolyzing hydrocarbon in a regenerative pyrolysis reactor, the reactor having (i) a mixing zone, (ii) a primary reaction zone, and (iii) a secondary reaction zone, the method comprising the steps of:
- providing combustion reactants to the mixing zone, the mixing zone being adjacent a first end of a bed packing located in the primary reaction zone;
- during a first time interval, reacting the combustion reactants to produce heat and combustion products;
- passing the combustion products through a plurality of passages in the bed packing from the first end to a second end to transfer heat to the bed packing, wherein the bed packing has a plurality of passages through the bed packing from the first end to a second end;
- conducting away the combustion products from the second end of the bed packing;
- providing a pyrolysis feed comprising a first hydrocarbon to the second end of the bed packing;
- and
- during a second time interval, exposing at least a portion of the pyrolysis feed to peak pyrolysis gas temperatures≧1500° C. and at a pressure of ≧248 kPag as the pyrolysis feed passes through the bed packing from the second end to the first end to produce a primary pyrolysis product containing unsaturated hydrocarbon, wherein (i) second time interval is less than the first time interval and (ii) the first time interval and the second time interval are combined to be within the range of 1 to 60 seconds.
A regenerative reactor system comprising:
- a reverse flow regenerative reactor comprising:
- a housing enclosing an interior region;
- a bed packing disposed within the interior region and having a plurality of flow passages through the bed packing;
- one or more pyrolysis poppet valves configured to manage the flow of pyrolysis streams between a location external to the interior region and a location within the interior region;
- one or more combustion poppet valves configured to manage the flow of combustion streams between a location external to the interior region and a location within the interior region;
- and
- a reactive feed distribution device configured to manage the flow of a reactive stream between a location external to the interior region and a location within the interior region.
Dependencies are inferred from the claim text.